Speaking on NBC's Today, he said: "What's going to happen is that we will put that [song] out ahead of the album. Her father started [a foundation] to teach young children not to take drugs. All the royalties from the record will go to that."

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Bennett added: "That was the last record she made. It was great, she sang beautifully."

Duets II, which also features collaborations with Lady GaGa and John Mayer, is released on September 19 in the UK and September 20 in the US.

Bennett turned 85 years old today and was surprised during his interview on Today when a cake bearing an image of his new album art was presented to him. He will mark the birthday with a celebration at the Metropolitan Opera on September 18.